apps/plugins/text_viewer/tv_action.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2002 Gilles Roux
  11  *               2003 Garrett Derner
  12  *               2010 Yoshihisa Uchida
  13  *
  14  * This program is free software; you can redistribute it and/or
  15  * modify it under the terms of the GNU General Public License
  16  * as published by the Free Software Foundation; either version 2
  17  * of the License, or (at your option) any later version.
  18  *
  19  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  20  * KIND, either express or implied.
  21  *
  22  ****************************************************************************/
  23 #include "plugin.h"
  24 #include "tv_action.h"
  25 #include "tv_bookmark.h"
  26 #include "tv_pager.h"
  27 #include "tv_screen_pos.h"
  28 #include "tv_settings.h"
  29 #include "tv_window.h"
  30
  31 bool tv_init(const unsigned char *file)
  32 {
  33     size_t size;
  34
  35     /* get the plugin buffer */
  36     unsigned char *buf = rb->plugin_get_buffer(&size);
  37
  38     tv_init_bookmark();
  39
  40     /* initialize modules */
  41     if (!tv_init_window(&buf, &size))
  42         return false;
  43
  44     /* load the preferences and bookmark */
  45     tv_load_settings(file);
  46
  47     /* select to read the page */
  48     tv_select_bookmark();
  49     return true;
  50 }
  51
  52 void tv_exit(void *parameter)
  53 {
  54     (void)parameter;
  55
  56     /* save preference and bookmarks */
  57     if (!tv_save_settings())
  58         rb->splash(HZ, "Can't save preferences and bookmarks");
  59
  60     /* finalize modules */
  61     tv_finalize_window();
  62 }
  63
  64 void tv_draw(void)
  65 {
  66     struct tv_screen_pos pos;
  67
  68     tv_copy_screen_pos(&pos);
  69     tv_draw_window();
  70     if (pos.line == 0)
  71         tv_new_page();
  72
  73     tv_move_screen(pos.page, pos.line, SEEK_SET);
  74 }
  75
  76 void tv_scroll_up(unsigned mode)
  77 {
  78     int offset_page = 0;
  79     int offset_line = -1;
  80
  81     if ((mode == TV_VERTICAL_SCROLL_PAGE) ||
  82         (mode == TV_VERTICAL_SCROLL_PREFS && preferences->vertical_scroll_mode == PAGE))
  83     {
  84         offset_page--;
  85 #ifdef HAVE_LCD_BITMAP
  86         offset_line = (preferences->page_mode == OVERLAP)? 1:0;
  87 #endif
  88     }
  89     tv_move_screen(offset_page, offset_line, SEEK_CUR);
  90 }
  91
  92 void tv_scroll_down(unsigned mode)
  93 {
  94     int offset_page = 0;
  95     int offset_line = 1;
  96
  97     if ((mode == TV_VERTICAL_SCROLL_PAGE) ||
  98         (mode == TV_VERTICAL_SCROLL_PREFS && preferences->vertical_scroll_mode == PAGE))
  99     {
 100         offset_page++;
 101 #ifdef HAVE_LCD_BITMAP
 102         offset_line = (preferences->page_mode == OVERLAP)? -1:0;
 103 #endif
 104     }
 105     tv_move_screen(offset_page, offset_line, SEEK_CUR);
 106 }
 107
 108 void tv_scroll_left(unsigned mode)
 109 {
 110     int offset_window = 0;
 111     int offset_column = 0;
 112
 113     if ((mode == TV_HORIZONTAL_SCROLL_COLUMN) ||
 114         (mode == TV_HORIZONTAL_SCROLL_PREFS && preferences->horizontal_scroll_mode == COLUMN))
 115     {
 116         /* Scroll left one column */
 117         offset_column--;
 118     }
 119     else
 120     {
 121         /* Scroll left one window */
 122         offset_window--;
 123     }
 124     tv_move_window(offset_window, offset_column);
 125 }
 126
 127 void tv_scroll_right(unsigned mode)
 128 {
 129     int offset_window = 0;
 130     int offset_column = 0;
 131
 132     if ((mode == TV_HORIZONTAL_SCROLL_COLUMN) ||
 133         (mode == TV_HORIZONTAL_SCROLL_PREFS && preferences->horizontal_scroll_mode == COLUMN))
 134     {
 135         /* Scroll right one column */
 136         offset_column++;
 137     }
 138     else
 139     {
 140         /* Scroll right one window */
 141         offset_window++;
 142     }
 143     tv_move_window(offset_window, offset_column);
 144 }
 145
 146 void tv_top(void)
 147 {
 148     tv_move_screen(0, 0, SEEK_SET);
 149 }
 150
 151 void tv_bottom(void)
 152 {
 153     tv_move_screen(0, 0, SEEK_END);
 154     if (preferences->vertical_scroll_mode == PAGE)
 155         tv_move_screen(0, -tv_get_screen_pos()->line, SEEK_CUR);
 156 }
 157
 158 unsigned tv_menu(void)
 159 {
 160     unsigned res;
 161     struct tv_screen_pos cur_pos;
 162     off_t cur_file_pos = tv_get_screen_pos()->file_pos;
 163
 164     res = tv_display_menu();
 165
 166     if (res == TV_MENU_RESULT_EXIT_MENU)
 167     {
 168         tv_convert_fpos(cur_file_pos, &cur_pos);
 169         if (preferences->vertical_scroll_mode == PAGE)
 170             cur_pos.line = 0;
 171
 172         tv_move_screen(cur_pos.page, cur_pos.line, SEEK_SET);
 173     }
 174     else if (res == TV_MENU_RESULT_MOVE_PAGE)
 175         res = TV_MENU_RESULT_EXIT_MENU;
 176
 177     return res;
 178 }
 179
 180 void tv_add_or_remove_bookmark(void)
 181 {
 182     tv_toggle_bookmark();
 183 }